package cn.zjitc.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyInterceptor1 implements HandlerInterceptor {
    // 在目标方法执行之前，执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle...");
        String param = request.getParameter("param");
        if ("yes".equals(param)) {
            return true;
        }else{
            request.getRequestDispatcher("/error.jsp").forward(request,response);
            return false; // 返回 true 代表放行，返回 false 代表不放行
        }
    }

    // 在目标方法执行之后，视图对象返回之前执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        modelAndView.addObject("name","王卓威");
        System.out.println("postHandle...");
    }

    // 在流程都执行完毕后执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion...");

    }
}
